关键词: ²⁷Al核磁共振谱, ²⁹Si核磁共振谱, 硅铝酸钠溶液

Abstract:

Aluminosilicate zeolites as one of the most important catalytic materials are widely applied in industrial reactions, and understanding of their synthetic mechanism is one of key factors in this field. ²⁷Al and ²⁹Si NMR techniques are one of powerful tools for characterization of zeolite synthesis, but unfortunately the study on ²⁷Al NMR spectra of aluminosilicate solutions is still argumentative, and the assignment of aluminosi-licate species in the solutions are challengeable. In this work, we have carefully compared ²⁷Al NMR spectra of various aluminosilicate solutions, harmonizing the assignments reported previously. Furthermore, we assigned ²⁹Si NMR spectra related to Al species. The peaks at δ: -75.1 and -82.5 in ²⁹Si NMR spectrum are related to Q² Al species, the peaks at δ: -84.5 and -90.8 are related to Q³ and Q⁴ Al species in aluminosilicate solutions, respectively.

Key words: ²⁷Al NMR spectroscopy, ²⁹Si NMR spectroscopy, Sodium aluminosilicate solution